They do need to increase Amtrak service from Houston. To go north, you have to take a bus from Houston to Longview or the Sunset Limited to San Antonio to get the Texas Eagle to Chicago or to New Orleans to catch the City of New Orleans to Chicago.

Service, especially high speed, connecting Houston, Dallas, Austin and San Antonio would attract a lot of riders.

The biggest problem is Southwest Airlines would fight that tooth and nail.

To get from Dallas you have to go to Fort Worth, switch trains and continue on to Oklahoma City.

Only one train per day. Arriving at Oklahoma City late at night at an old, not refurbished depot. The return train leaves in the early morning hours. Therefore you can't get to OKC early in the day and return that night, so it requires a hotel stay in Oklahoma City.